Commit 886445a6 authored by Mike Day's avatar Mike Day Committed by Alexander Graf
Browse files

spapr_rtas: add get-sensor-state RTAS interface 



This interface allows a guest to read various platform/device sensors.
initially, we only implement support necessary to support hotplug:
reading of the dr-entity-sense sensor, which communicates the state of
a hotplugged resource/device to the guest (EMPTY/PRESENT/UNUSABLE).

See docs/specs/ppc-spapr-hotplug.txt for a complete description of
this interface.

Signed-off-by: default avatarMike Day <ncmike@ncultra.org>
Signed-off-by: default avatarMichael Roth <mdroth@linux.vnet.ibm.com>
Reviewed-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarDavid Gibson <david@gibson.dropbear.id.au>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 8c8639df

hw/ppc/spapr_rtas.c

+43 −0
Original line number Diff line number Diff line
@@ -377,6 +377,47 @@ out_unimplemented: 
    rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);

}



static void rtas_get_sensor_state(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                                  uint32_t token, uint32_t nargs,

                                  target_ulong args, uint32_t nret,

                                  target_ulong rets)

{

    uint32_t sensor_type;

    uint32_t sensor_index;

    sPAPRDRConnector *drc;

    sPAPRDRConnectorClass *drck;

    uint32_t entity_sense;



    if (nargs != 2 || nret != 2) {

        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

        return;

    }



    sensor_type = rtas_ld(args, 0);

    sensor_index = rtas_ld(args, 1);



    if (sensor_type != RTAS_SENSOR_TYPE_ENTITY_SENSE) {

        /* currently only DR-related sensors are implemented */

        DPRINTF("rtas_get_sensor_state: sensor/indicator not implemented: %d\n",

                sensor_type);

        rtas_st(rets, 0, RTAS_OUT_NOT_SUPPORTED);

        return;

    }



    drc = spapr_dr_connector_by_index(sensor_index);

    if (!drc) {

        DPRINTF("rtas_get_sensor_state: invalid sensor/DRC index: %xh\n",

                sensor_index);

        rtas_st(rets, 0, RTAS_OUT_PARAM_ERROR);

        return;

    }

    drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);

    entity_sense = drck->entity_sense(drc);



    rtas_st(rets, 0, RTAS_OUT_SUCCESS);

    rtas_st(rets, 1, entity_sense);

}



static struct rtas_call {

    const char *name;

    spapr_rtas_fn fn;
@@ -508,6 +549,8 @@ static void core_rtas_register_types(void) 
                        rtas_get_power_level);

    spapr_rtas_register(RTAS_SET_INDICATOR, "set-indicator",

                        rtas_set_indicator);

    spapr_rtas_register(RTAS_GET_SENSOR_STATE, "get-sensor-state",

                        rtas_get_sensor_state);

}



type_init(core_rtas_register_types)